|Joined:||Fri, Sep 24th 2010, 13:12||Roles:||N/A||Moderates:||N/A|
|Heathkit SB-401 relay RL1||Aug 7th 2012, 22:09||3||2,121||on 9/8/12|
|Lightning Arrestors||Jun 2nd 2012, 13:48||8||3,064||on 26/9/12|
|Heathkit SB-401 relay RL1||KapAceHigh||on 9/8/12|
|Thanks Zac for your reply.
Looking into this a bit further, there are two additional contacts (lugs) that are not connected. As you state, the mod may have been already made. So I am not going to attempt any changes unless I can come up ith the connection diagram for the relay. Also, it might not be possible without unsoldering a lot of the wires to this relay due to the high density of connections to it.
|Heathkit SB-401 relay RL1||KapAceHigh||on 7/8/12|
|I'm thinking of following a Heathkit recommendation to connect contact 7 of RL1 to ground to eliminate the problem of the transmitter remaining on transmit when I end transmission. This is due to "gassy" final tubes, the Heathkit bulletin states.
Maybe I'm missing something, but going through the schematics, I come up with six poles for RL1, not five. I do see a contact lug on the RL1 on my SB-401 without any connection. Can I assume this is number 7? Don't know if there are any other contacts without a connection. This could be possible.
Wonder if anyone has the connection diagram for RL1, or did the suggested fix.
|Lightning Arrestors||KapAceHigh||on 6/6/12|
Thanks for the information and the importance of grounding everything.
Guess the best precaution is to disconnect the antenna and power from all the equipment ahead any approaching thunderstorm.
|Lightning Arrestors||KapAceHigh||on 2/6/12|
|When I was WB2MHI from 1963 to 1968, the only type of coax lightning arrestor was the gap type, which I installed on my coax transmission line right ouside the entrance to the shack.
after about 42 years, I'm again a licensed ham,KC2ZDT, but still have vintage vacuum tube gear. My question is this: is a gas discharge tube type arrestor necessary with vintage tube equipment.